In present work,the effect of Ge substitution tor Mn on crystal structure and martensitic transformation was carefully investigated in magnetic shape memory Ni50Mn36-xGexSn14(x=0,1)alloys.From X-ray diffraction(XRD)patterns,it can be found that each sample possesses cubic austenitic structure(L21)at room temperature and the main peak(220)shifts to higher degree with Ge doping,indicating that the cell volume of auste-nitic phase shrinks.With Ge content increasing,martensitic transformation(MT),temperature shifts to higher temper-ature region and the difference of magnetization between martensitic and austenitic phases(△M)also increases.In addition,the magnetocaloric effect(MCE)and phase transition strain(△L/L)were investigated in Ni50Mn35.GeSn14 alloy.The maximal magnetic entropy change(△Sm)associated with martensitic transition is 3.9 J·kg-1-K-1 with applied magnetic field change of 5 T and the maximal △L//L reaches 0.18％in this alloy.

Dong Zheng;Chao Jing;Bo Lu;Zhe Li;Kun Xu

Department of Physics,Shanghai University,Shanghai 200444,China;Laboratory for Microstructures,Shanghai University,Shanghai 200444,China;College of Physics and Electronic Engineering,Qujing Normal University,Qujing 655011,China

稀有金属（英文版）

[1]Dong Zheng;Chao Jing;Bo Lu;Zhe Li;Kun Xu-.Martensitic transformation,magnetocaloric effect and phase transition strain in Ni50Mn36-xGexSn14 Heusler alloys)[J].稀有金属（英文版）,2022(12):4217-4222

Ni50Mn36,xGexSn14,auste,nitic,Ni50Mn35,GeSn14

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